feat: integrate Kakao OAuth for user authentication and enhance user repository

- Added Kakao OAuth client implementation for handling authentication flows.
- Updated user repository to support OAuth-based user creation and retrieval.
- Introduced Redis-based session management for OAuth sessions.
- Enhanced in-memory user repository to handle OAuth user data.
- Updated environment configuration files to include new OAuth settings.
- Modified API routes to support Kakao login and registration flows.
- Added Prisma schema updates for user model to accommodate OAuth fields.
- Implemented tests for the new authentication flow and user repository methods.

pnpm-lock.yaml

@@ -87,6 +87,9 @@ importers:
       '@fastify/cors':
         specifier: ^10.0.1
         version: 10.1.0
+      '@prisma/client':
+        specifier: ^7.2.0
+        version: 7.2.0(prisma@7.2.0(@types/react@19.2.7)(react-dom@19.2.3(react@19.2.3))(react@19.2.3)(typescript@5.9.3))(typescript@5.9.3)
       '@sammo-ts/common':
         specifier: workspace:*
         version: link:../../packages/common